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Effects of solution temperature on mechanical properties of 319.0 aluminum casting alloys containing trace beryllium

Published online by Cambridge University Press:  31 January 2011

Paih-Shiarng Wang ,
Sheng-Long Lee ,
Jing-Chie Lin  and
Min-Ten Jahn
Paih-Shiarng Wang
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan, Republic of China
Sheng-Long Lee
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan, Republic of China
Jing-Chie Lin
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan, Republic of China
Min-Ten Jahn
Affiliation:
Mechanical Engineering Department, California State University, Long Beach, California 90840–8305
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Abstract

The effects of beryllium (Be) and solution temperature on the morphologies of iron intermetallics, silicon particles, and copper intermetallics, relative to the mechanical properties of 319.0 alloys, were investigated. The experimental results indicated that adding Be to the alloy can raise the Al–Al2Cu eutectic melting temperature, change some plateletlike shape (βndash;Al5FeSi) of iron intermetallics to comparatively harmless Chinese-script morphologies (α–Al8Fe2Si), and reduce the amount and average length of βndash;Al5FeSi platelets. During high-temperature solution treatment (>500 °C), the thinner and smaller the β–Al5FeSi platelets were, the faster they dissolved and fragmented. However, where the solution temperature exceeded the Al–Al2Cu eutectic melting point, the Al–Al2Cu eutectic melted and resulted in an ultrafine eutectic phase on quenching, which deteriorated mechanical properties. The fracture behavior of 319 alloy was affected by the morphologies of the iron intermetallics, silicon particles, and copper intermetallics. Fractographic analysis of tested compact tension specimens revealed that the fracture processes were mainly initiated by void nucleation at β–Al5FeSi platelets as a result of their cracking and decohesion from the matrix. Adding Be to the 319.0 alloy and optimizing the solution temperature could significantly decrease the number of fracture-initiation sites of β–Al5FeSi platelets and improve the tensile properties and fracture toughness.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 9 , September 2000 , pp. 2027 - 2035
Copyright
Copyright © Materials Research Society 2000

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